On your settings page you can auth your Twitter and GitHub accounts. Twitter was added so the bot can credit you when it announces stories (and we plan equivalent Fediverse support as part of ActivityPub integration). Pretty much everyone’s on GitHub, so that makes sense even if the site doesn’t do anything special with it. With n=2, as much as we can define the current policy it’s “whatever’s useful to the site, plus GitHub”.
We just received a PR to add Keybase support. To decide if I should work with the author to complete it, I wanted to ask folks if they would find Keybase particularly useful, and what our criteria should be for these integrations. What makes an integration worth the dev time to add and maintain?